X  xx x x x xx



BEST AVAILABLE COP":

Patented July 3, 1928.

scriptionlfiijfgfl thel-ill mn netm tending below-J elguoyunt odyi reeted downwardly into the water,

BEST AVAILABLE our v lower entension-tnbe isfthen, applied ,to the tiontubes are directed above the biloyant lowerjiend. the ineinfillnminating tube body' end above the water. sectio'ii 2. i f 1 It is ofeourse understood when inspections 'g Theegppen andlowe nds of the mfiinpb, emm ng niede 'into deep holes, or dark serietion tnbe 'fs eetionexternally serew"o enispac es,-tlmt the. upper illuminating and threaded-3J0" eeeiVe'gt-he;internelly 'serevzolisepz ngztubgseetions canberemoyed'from h d 5 1 11.? -..n' m ";l ;f end-1' theirit ip et wi'm b n res eetively. "1' f zg ;'-Tlie m t 1nyadvanteges'of the herein dehe mm observat i tgbe section is-fscribegl inventi'onwill readily suggest themprovided}; ith .ain npfier xtensiontohseiw e selvestofgtliose skilled? in? the elrt to which it i i' bfl fl iq s-Qu-:Thl.;i i?l' 3-h3 itslgai pert s n s i iipper'r'and "lower; jeifd's'; externnlly'.' "screw 2: I 'dof'notf'wish tob'e understood as having threzided' a'ndki's conneeted.- z t itsfl-lowerend {limited myself tqflthe exaet" details of conto fthe eoi'ipling member ,16; The main ob-. struetion and arrangement of parts as herein senifietioni tubeseetion ii fs glsojprevidedwitli-j described and illustrated as', it is ineni fest a1;lower 'iobsenvationfgtn '5seetion;}-l9,- 1g{1fhe; that varietio isqand modifipfations {may be tnbesectionylflfihasiits jupgerjandj lowenends; made without defiertingiro mjthe spirit and ezgternellyser'ew' threade' and is conneetedseo e offm {inp' ention;and the'termsIpf the "the-lowencoupling {nemfol owing e aims; henee' lwish it to be u'nder.- it. @322 r stood than,re ry h r g t-te-ixm e any 7 r e O ;the npper olqseryatmn, sneh changes,or nodifieetiongeis na' fe'ii ly tub les t ox; 183 sj l0segl3bymeans qfia; suit; falliwithinfthe seopehd f thei ppende clai ns' ableserey -threaded,czip20 ndthe CapiZQ; when feirly constriied d-to tube s'ectiofiililfiselosedgbiwmeens of a. glass "bodies, ajfbnoygint membe1 ,',1a;t 1be essing closure'22 held iro n dispepeme'ntb means through-{seidybtip eiit member an fixed aiM 2mP Per 9 *'ii tl ing bffi i i'l il iifi'ijll m q fi and the gglosure ice -.ju,'.ii trpnspurent, elosnm and (d1 fonthe lowr end 0 said'tube, a flanged ring while the for'retaining the transparent closure in POSP upper ends of the illuminating and observution, a straight sectional HHlUpQINlOHi oh- BEST AVAILABLE COP th o 'hottfim of said observationftube and a 

